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  5. Demo 11: Briggs Rauscher Oscillating Reaction

Briggs Rauscher Oscillating Reaction

Materials

1 liter Erlenmeyer Flask

Magnetic Stir Plate

Stirbar

Premeasured Solutions (usually 300 mL each)

A. 0.14M Potassium Iodate (KIO3)
              (29.96gm/liter)

B.  3.2M Hydrogen Peroxide (H2O2), 0.17M Perchloric Acid (HClO4)
              (364ml 30% H2O2,  14.6ml perchloric acid per liter)

C.  0.024M Manganous Sulfate (MnSO4), 0.15M Malonic Acid, 10g/Liter Soluble Starch
              (15.7gm malonic, 4.06gm MnSO4, 10gm/liter starch)

       
       

Procedure

Mix equal amounts of solutions A, B, and C in that order with stirring. Solution will oscillate from clear(yellow) to blue. Reaction lasts about 20 minutes. Minimum recommended amounts is 250ml per each solution.     
       
     

Waste disposal:

Combine wastes and neutralize carefully. The neutralized solution can be poured down the sink.